unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DB, DBClient, MConnect, SConnect, ScktComp;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    ServerSocket1: TServerSocket;
    ClientSocket1: TClientSocket;
    Edit1: TEdit;
    Edit2: TEdit;
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure ServerSocket1ClientRead(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure Button1Click(Sender: TObject);
    procedure Edit2Exit(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
   ServerSocket1.Port := 23;
   ServerSocket1.Active := True;

  ClientSocket1.Port :=  23;
  //local TCP/IP address of the server
  ClientSocket1.Host :=  Edit2.Text;
  ClientSocket1.Active :=  true;
end;



procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
   ServerSocket1.Active := false;
   ClientSocket1.Active := false;
end;

procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
  Socket: TCustomWinSocket);
  var
    i:integer;
    sRec : string;
begin
  for i := 0 to ServerSocket1.Socket.ActiveConnections-1 do
  begin
    with ServerSocket1.Socket.Connections[i] do
    begin
      sRec := ReceiveText;
      if sRec <> '' then
      begin
        Memo1.Lines.Add(RemoteAddress + ' sends :') ;
        Memo1.Lines.Add(sRec);
      end;
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if ClientSocket1.Active then
      ClientSocket1.Socket.SendText(Edit1.Text);
  Edit1.Text := '';
end;

procedure TForm1.Edit2Exit(Sender: TObject);
begin
   ClientSocket1.Active := false;
   ClientSocket1.Host :=  Edit2.Text;
   ClientSocket1.Active := true;
end;

end.